File:Expeditions organized or participated in by the Smithsonian Institution.. (1910) (14595767390).jpg

Identifier: expeditionsorgan191013191516smit (find matches)
Title: Expeditions organized or participated in by the Smithsonian Institution..
Year: 1912 (1910s)
Authors: Smithsonian Institution
Subjects: Scientific expeditions
Publisher: Washington, D.C. : Smithsonian Institution
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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66.—Two races of Bahama shells (Ccrion) planted Ijy Dr. Bartsch onkeys between Miami and Tortugas, Florida. Photograph by National ^Museum. ducing some of them into other islands, so that the effect of a changeof environment could be studied later. The partv returned to Nassau on )\Iay 26. and then set sail forMiami, where it remained until the end of the month. During thistime a fine series of that most beautiful of all North American landshells, Ligiins, was secured, as well as a g;oodly number of otherspecies. A number of dredge hauls were made north of Cape Florida,in shallow water, by the Anton DoJirn and a tine series of marineinvertebrates secured. On May 31 the expedition sailed south for Key West. On thiscruise, and during- the stay at Miami, the two races of BahamaCerions were introduced at different points. NO. 30 SMITHSONIAN EXPLORATIONS, I912 61 During the cruise from Miami to Key West, a special effort wasmade to examine as manv of the keys as could he reached conven-
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FiG. 67.—One of the commonest shells on the Bahama eroded rock beaches,Tectarius muricatus L. Photograph by Bartsch. iently for Ccrion iiicaiiinii Binney, and, wherever found, to gather a^large a series as possible. It was observed that most of the keys 62 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6o which had been flooded during the hurricanes of 1906 and 1910, con-tained practically no live Cerions. though dead ones were observedin a number of places, and this caused one to wonder whether sea-water might serve as a decided barrier to these forms. Little is known about the life history of Cerions. They areremarkably variable, usually very restricted in their distribution, andvery abundant where they occur. They are very tenacious of life,specimens having been kept in the U. S. National Museum for morethan eight years; these occasionally leave the tray in which they areplaced and seek a new resting-place. Cerions are also not particularabout specific food, in fact they might be loo

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